选项
A.
A.Both bombs produce the same three effects: heat, blast, and radiation. The first of which usually causes the most fatalities.
B.
Both bombs produce the same three effects: heat, blast, and radiation, the first ofthem usually causes the most fatalities.
C.
C.Both bombs produce the same three effects: heat, blast, and radiation, the first of which usually causes the most fatalities.
D.
D.Both bombs produce the same three effects: heat, blast, and radiation,the first of which usually causingthe most fatalities.
正确答案：